<!DOCTYPE html>
<script>
function start() {
    if (window.testRunner)
        testRunner.dumpAsText();
    var html = document.createElement('html');
    html.innerHTML = 'x<style>*{ float: right; }';
    var body = html.children[1];
    document.body = body;
    document.body.offsetTop;

    document.body.innerHTML = '<style>*{ all: initial; }';
    document.body.style.writingMode = 'vertical-rl';
}
</script>
<body onload="start()"></body>
